Greg Klein's Blog

LEDs on a String

leave a comment »

Okay, so a friend and I got bored and decided to play with this idea. We attached a few leds to some thin string (we used dental floss), creating a pendulum. Then we turned off the lights, pointed a camera up, opened the shutter for about 25 seconds and released the led:

A 25 second exposure of a single red led.

And then we tried making a double pendulum by adding a second, green, led.

And again, but with two leds to create a double pendulum.

Double pendulums are neat! They’re incredibly complex despite their simple construction, but can be correctly modelled with math.

Here’s our setup for the double pendulum. And remember, if you decide to try this, use a resistor in series with each led.

The double pendulum with the lights on.

Written by gregklein

November 14, 2011 at 4:49 pm

Posted in math

Tagged with , , , ,

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: